Expression 4: "f" left parenthesis, "x" , right parenthesis equals log Subscript, 2 , Baseline left parenthesis, "x" ! , right parenthesis left brace, "x" greater than or equal to 0 , right bracefx=log2x!x≥0
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Expression 5: "g" left parenthesis, "x" , right parenthesis equals ceiling left parenthesis, log Subscript, 2 , Baseline left parenthesis, Start product from "i" equals 1 to "x" , end product, "i" , right parenthesis , right parenthesisgx=ceillog2x∏i=1i
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Expression 6: "h" left parenthesis, "x" , right parenthesis equals ceiling left parenthesis, Start sum from "i" equals 1 to "x" , end sum, log Subscript, 2 , Baseline left parenthesis, "i" , right parenthesis , right parenthesishx=ceilx∑i=1log2i